"Math through play" from a developer of psychomathematics, multi-base blocks, and the six-stage theory of learning mathematics. Freely download PDFs of Dienes' Ruritania stories and math games such as Strip Mathematics, Circular Villages, Six Stages with Integers, Six Stages with Rationals, Logic Games (Quantifiers), and the Twenty-Six Flower Game. Dienes, retired director the Centre de Recherche en Psychomathématiques at the Université de Sherbrooke (Quebec), also offers his academic articles, including "Mathematics as an Art Form" and "What is a Base?"